s = "exe"
if "" in s:
    print("in", s)  # ok
else:
    print("not in", s)

t = ["exe"]
if "" in t:
    print("in", t)
else:
    print("not in", t)  # ok

t = ("exe",)
if "" in t:
    print("in", t)
else:
    print("not in", t)  # ok

s1 = "exe"
if "" in s1:
    print("in", s1)  # ok
else:
    print("not in", s1)
